EP2872686B1 - Tumble drier with a lint trap - Google Patents

Tumble drier with a lint trap Download PDF

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Publication number
EP2872686B1
EP2872686B1 EP13770503.4A EP13770503A EP2872686B1 EP 2872686 B1 EP2872686 B1 EP 2872686B1 EP 13770503 A EP13770503 A EP 13770503A EP 2872686 B1 EP2872686 B1 EP 2872686B1
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EP
European Patent Office
Prior art keywords
fluff
process air
separator
lint
laundry drying
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EP13770503.4A
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German (de)
French (fr)
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EP2872686A2 (en
Inventor
Ralf BÖMMELS
Bernd GEMÜNDEN
Jürgen Hess
Vladimir Proseanic
Svetlana Visnepolschi
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces

Definitions

  • the invention relates to a laundry drying apparatus having a lint retention device, comprising a lint separator, which is connected upstream of a lint wetting device.
  • Fluffs are typically discharged from the laundry to be dried into the surrounding process air during a drying process, and include, for example, fiber portions produced during washing or drying. If they are not removed from the process air, they can attach themselves to a process air condenser, at which typically warm moist process air exiting the laundry drum is cooled down and thereby condensed out. By settling the lint reduces the effect of the process air condenser. Cleaning the process air condenser from the settled lint is complicated and can usually only be carried out by service personnel.
  • a laundry drying apparatus having a lint retention device, comprising a lint separator, which is preceded by a lint wetting apparatus.
  • agglomerates of lint and water can be formed by the lint wetting device by wetting fluff before the lint separator, and the lint wetting device has at least one steam generator and / or at least one nebulizer.
  • the lint wetting device has at least one steam generator and / or at least one nebulizing device.
  • steam and / or small particles of water can be introduced into a stream of lint-laden process air at high density, which permits a high degree of wetting or wetting of the lint and thus also an effective lint retention or lint separation.
  • the steam generator may in particular be a hot steam generator or a wet steam generator.
  • the nebulizing device can be in particular a spray device, an atomizer, in particular a piezoactively driven atomizer, or a centrifuge, in particular for producing an aerosol mist.
  • the vapor and / or the mist particles are absorbed at the surface of the lint. Due to surface tension of the water, contacting agglomerates or lint can bond together. For the same reason, adhesion or adhesion of the agglomerates is observed at almost any location where the agglomerates impinge or unimpregnated lint hits a wetted location.
  • the Flusenabscheide has a filter bag for retaining wetted lint.
  • This has the advantage that it is inexpensive, has a large capacity and is easy to clean.
  • the elongate extent allows sufficient time for effective agglomeration even with an introduction of steam and / or mist particles immediately before opening the filter bag. Due to the agglomerates, a pore size can be comparatively high, so that a process air flow is not substantially hindered.
  • the Flusenabscheide has a flat screen for retaining wetted lint.
  • the flat screen is easy to clean.
  • the sieve may in particular be a metallic sieve, a woven fabric or a fleece.
  • the Flusenbenässungsvorraum is adapted to generate at least a turbulent flow of steam and / or mist particles. This improves formation of the agglomerates.
  • the fluff-wetting device can be designed, for example, with one or at least one free jet nozzle or Karman swirling-flow generating device.
  • the lint separator has a cyclone separator for depositing wetted lint.
  • the agglomerates are so heavy that they can be separated relatively easily from the process air.
  • the agglomerates adhere well to walls of the cyclone on which they strike, which further promotes effective separation or containment.
  • a cyclone separator has the advantage that it does not need to be cleaned because it can dissipate the lint in a lint / water mixture (resulting, for example, by the agglomerates from trickling down the walls of the cyclone separator) and so on a cleaning can be dispensed with, eg upon removal of lint separated and subsequently collected by the cyclone separator, or may be significantly shortened.
  • a contacted by fluff wall of the cyclone is specifically moistened. This improves the adhesion of agglomerates and free lint (if still present) and also letting the lint down its exit from the cyclone separator.
  • a wall of the cyclone separator which can be contacted by wetted lint is equipped with a sliding layer.
  • the sliding layer may in particular have PTFE, or else nanostructures or nanoparticles, for example for producing a lotus effect.
  • the cyclone separator has a process air inlet and a compressed air inlet oriented at an angle such that compressed air entering through the compressed air inlet is set into rotary motion by means of lint-laden process air flowing in through the process air inlet. This allows a particularly strong rotational movement and thus separation effect.
  • the steam and / or the mist particles are introduced into the lint separator by the compressed air inlet or can be supplied, which enables particularly good mixing with the lint-laden process air.
  • An outlet of the flax-wetting device may thus open or extend, in particular, into a compressed-air channel leading to the compressed-air inlet.
  • the and / or the mist particles may be introduced into the lint separator through the process air inlet.
  • the process air itself may generate a rotational movement, e.g. by a correspondingly curved process air duct in the cyclone separator.
  • a laundry dryer comprising a laundry drum and a process air condenser, which are connected via a process air leading process air duct, and having a fluidically behind the laundry drum and in front of the condenser in the process air duct arranged Flusenabscheide observed, fluidically behind the laundry drum and a Flusenbenässungsvorraum is arranged before the Flusenabscheide observed.
  • the laundry drying device according to the invention is accessible to the same advantages as the lint retention device and can be configured in an analogous manner.
  • the laundry drying apparatus may in particular be a tumble dryer or a washer-dryer.
  • the process air condenser may be, for example, a cooling water condenser or an evaporator of a heat pump.
  • Fig.1 shows a sectional side view of a sketch of a laundry dryer in the form of a circulating air dryer W.
  • the dryer W has a laundry drum 11 for receiving laundry to be dried (o.Fig.) On.
  • a circulating process air channel 12 is connected to the laundry drum 11.
  • warm-moist process air P can enter from the laundry drum 11 into the process air channel 12 and flows to a process air condenser 13, which cools and condenses the process air P, so that they are behind the process air condenser 13 as cool-dry process air P is present.
  • This cool-dry process air P continues to flow to a heater 14 in which it is heated in order to be reintroduced into the laundry drum 11 as a warm-dry process air P.
  • the warm, dry process air P is particularly suitable for removing moisture from the laundry.
  • the flow of the process air P in the process air channel 12 is accomplished by means of a blower 15, which is here, for example, between the process air condenser 13 and the heater 14 in the process air channel 12 turned on.
  • a lint separator 16 for separating or separating lint from the process air P.
  • the lint is typically entrained with the process air P sweeping the laundry drum 11 over the laundry.
  • the Flusenabscheide issued 16 is to prevent the lint get to the process air condenser 13 and this heat-insulating cover.
  • the tumble dryer W has a fluidly connected before the Flusenabscheide observed with the process air duct 12 Flusenbenässungsvorraum 17.
  • Flusenbenässungsvorraum 17 steam and / or mist particles are introduced before the Flusenabscheide overlooked 16 in the process air duct P to produce agglomerates of water and lint, which agglomerates can be retained much better by the Flusenabscheide responded 16 than single (dry) lint.
  • the Flusenabscheide annoying 16 and the Flusenbenässungsvorraum 17 may also be integrated in a common assembly.
  • the lint wetting device 17 may comprise, for example, a steam generator and / or a nebuliser (e.g., a piezoelectric aerosol generator).
  • a nebuliser e.g., a piezoelectric aerosol generator
  • Fig.2 shows a sectional view in side view of a possible embodiment of the Flusenabscheide worn 16 according to a first embodiment.
  • the Flusenabscheide worn 16 here has a filter bag 20 for retaining wetted lint. Fluidically before the filter bag 20, at least two nozzle heads 21 of the flax wetting device 17 open into the process air channel 12, by means of which compressed air and / or mist particles D are introduced into the process air channel 12 in order to mix with the lint-containing process air P and to form the agglomerates.
  • Fluidically behind the nozzle heads 21 and thus here in the process air channel 12 is in each case a body 22, which is flowed around by the steam and / or the mist particles D.
  • a body 22 which is flowed around by the steam and / or the mist particles D.
  • Karman vortex street K With counter-rotating vortices.
  • an agglomeration is improved.
  • Due to the elongated in the flow direction of the process air P expansion of the filter bag 20 results in a sufficiently effective for a particularly long mixing distance.
  • FIG. 3 shows a sectional side view of another possible Flusenabscheide Sk 16 according to a second embodiment with a cyclone 31.
  • This Zyklonabscheider 31 may, for example, a similar basic structure as a in US 6,270,558 B1 have described cyclone separator.
  • the process air P in the cyclone 31 due to a frusto-conical outer wall 32 and a frusto-conical body 33 disposed therein on a truncated cone extending spiral path runs.
  • the provision of the body 33 results in maintaining a consistently high velocity and rotational energy of the process air P.
  • By the rotational component of the process air P heavier particles are pressed against the wall 32 and can be spatially separated from the lighter (pure) process air P.
  • the compressed air jet A is used to introduce the steam and / or mist particles D produced by the flax wetting device 17.
  • the higher mass agglomerates thus formed are effectively thrown against the wall 32 by the rotational movement (centrifugal force) and adhere there due to the high adhesion of water until enough water volume has accumulated to allow the water to run down with the lint associated therewith, e.g. as drops of water T.
  • the drops of water T can be collected, for example, in a tub 34.
  • the process air P emerging from the cyclone separator 31 is highly freed from lint.
  • the cyclone separator 31 also serves to further dry the process air P, since moisture entrained by the laundry can also be deposited on the wall and subsequently drip off.
  • the wall 32 may be provided with a sliding layer, at least on its upper side wettable by the agglomerates, e.g. PTFE, nanostructures or nanoparticles, e.g. for making a lotus effect.
  • agglomerates e.g. PTFE
  • nanostructures or nanoparticles e.g. for making a lotus effect.
  • the present invention is not limited to the embodiments shown.
  • the cyclone separator may also have a selectively wetted wall, for which purpose, for example, a sprinkler system may be used.
  • the fluff wetting device may be fed by condensate precipitating on the process air condenser.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Cleaning And Drying Hair (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Cyclones (AREA)

Description

Die Erfindung betrifft ein Wäschetrocknungsgerät mit einer Flusenrückhaltevorrichtung, aufweisend eine Flusenabscheideeinrichtung, welcher eine Flusenbenässungsvorrichtung vorgeschaltet ist.The invention relates to a laundry drying apparatus having a lint retention device, comprising a lint separator, which is connected upstream of a lint wetting device.

Ein solches Wäschetrocknungsgerät geht hervor aus der EP 2 202 349 A2 . Darin ist die Flusenabscheideeinrichtung ein Sieb und die Flusenbenässungsvorrichtung eine Reinigungseinrichtung, durch welche eine Reinigungsflüssigkeit über das Sieb leitbar ist.Such a clothes dryer emerges from the EP 2 202 349 A2 , Therein, the Flusenabscheideeinrichtung is a sieve and the Flusenbenässungsvorrichtung a cleaning device through which a cleaning liquid is passed through the wire.

Flusen werden typischerweise während eines Trocknungsprozesses von der zu trocknenden Wäsche in die umgebende Prozessluft abgegeben und umfassen beispielsweise bei einem Waschen oder Trocknen erzeugte Faserteile. Falls Sie nicht aus der Prozessluft entfernt werden, können sie sich an einem Prozessluft-Kondensator festsetzen, an welchem typischerweise aus der Wäschetrommel austretende warm-feuchte Prozessluft abgekühlt und dadurch auskondensiert wird. Durch das Absetzen der Flusen verringert sich die Wirkung des Prozessluft-Kondensators. Ein Reinigen des Prozessluft-Kondensators von den abgesetzten Flusen ist aufwändig und kann in der Regel nur durch Servicepersonal durchgeführt werden.Fluffs are typically discharged from the laundry to be dried into the surrounding process air during a drying process, and include, for example, fiber portions produced during washing or drying. If they are not removed from the process air, they can attach themselves to a process air condenser, at which typically warm moist process air exiting the laundry drum is cooled down and thereby condensed out. By settling the lint reduces the effect of the process air condenser. Cleaning the process air condenser from the settled lint is complicated and can usually only be carried out by service personnel.

Um das Absetzen der Flusen an dem Prozessluft-Kondensator zu verhindern, ist es bekannt, strömungstechnisch eine Flusenabscheideeinrichtung in Form eines Gitterfilters im einem Prozessluftkanal zwischen der Wäschetrommel und dem Prozessluft-Kondensator anzuordnen. Aufgrund einer meist geringen Ausdehnung von Flusen von meist nur ca. einem Mikrometer können die Flusen die meisten Gitterfilter, welche typischerweise eine größere Gitterweite aufweisen, passieren. Gitterfilter mit einer geringeren Gitterweite weisen nachteiligerweise einen hohen Strömungswiderstand für die durchlaufende Prozessluft auf. Zudem müssen die Gitterfilter gelegentlich von (größeren) Flusen usw. gereinigt werden, was händisch von einem Endnutzer durchzuführen und aufwändig ist.In order to prevent settling of the lint to the process air condenser, it is known to fluidically arrange a Flusenabscheideeinrichtung in the form of a grid filter in a process air duct between the laundry drum and the process air condenser. Due to a usually small extent of lint, usually only about a micrometer, the lint can pass most of the lattice filters, which typically have a larger lattice width. Lattice filters with a smaller grid width disadvantageously have a high flow resistance for the continuous process air. In addition, the lattice filters must occasionally be cleaned of (larger) lint, etc., which is done manually by an end user and is cumbersome.

Auch ist aus EP 1 380 683 A2 oder DE 197 39 378 A1 die Verwendung einer Flusenabscheideeinrichtung in Form eines Zyklonabscheiders bekannt. Hierbei ist nachteilig, dass dessen Abscheidewirkung vergleichsweise gering ist, da eine effektive Dichte der sich in dem Prozessluftstrom befindlichen Flusen ähnlich der Dichte von Luft ist.Also is off EP 1 380 683 A2 or DE 197 39 378 A1 the use of a Flusenabscheideeinrichtung known in the form of a cyclone. A disadvantage here is that its separation effect is comparatively low, since an effective density of the lint located in the process air stream is similar to the density of air.

Aus der EP 0 535 348 A1 ist eine Flusenabscheideeinrichtung in Form eines Prozessluftwäschers bekannt, bei welcher die Prozessluft mit Kondensat beregnet wird und sich an den Kondensatvorhang anheftende Flusen aus der Prozessluft ausfallen. Jedoch ist eine solche Flusenabscheideeinrichtung vergleichsweise wenig effektiv und zudem baulich aufwändig.From the EP 0 535 348 A1 a Flusenabscheideeinrichtung in the form of a process air washer is known in which the process air is irrigated with condensate and precipitate on the condensate curtain lint from the process air. However, such a Flusenabscheideeinrichtung is relatively less effective and also structurally complex.

Es ist die Aufgabe der vorliegenden Erfindung, die Nachteile des Standes der Technik zumindest teilweise zu überwinden und insbesondere eine verbesserte Möglichkeit zur Abscheidung von Flusen aus der Prozessluft eines Wäschetrocknungsgeräts bereitzustellen.It is the object of the present invention to at least partially overcome the disadvantages of the prior art and, in particular, to provide an improved possibility for the separation of lint from the process air of a laundry drying apparatus.

Diese Aufgabe wird für ein Wäschetrocknungsgerät gemäß den Merkmalen des unabhängigen Patentanspruchs gelöst. Bevorzugte Ausführungsformen und Weiterbildungen sind insbesondere den abhängigen Patentansprüchen entnehmbar, außerdem der nachfolgenden Beschreibung sowie der beigefügten Zeichnung.This object is achieved for a laundry drying apparatus according to the features of the independent claim. Preferred embodiments and further developments are in particular the dependent claims removed, also the following description and the accompanying drawings.

Die Aufgabe wird demnach gelöst durch ein Wäschetrocknungsgerät mit einer Flusenrückhaltevorrichtung, aufweisend eine Flusenabscheideeinrichtung, welcher eine Flusenbenässungsvorrichtung vorgeschaltet ist. Dabei sind durch die Flusenbenässungsvorrichtung mittels Benässung von Flusen strömungstechnisch vor der Flusenabscheideeinrichtung Agglomerate aus Flusen und Wasser bildbar, und die Flusenbenässungsvorrichtung weist mindestens einen Dampferzeuger und/oder mindestens eine Vernebelungseinrichtung auf.The object is accordingly achieved by a laundry drying apparatus having a lint retention device, comprising a lint separator, which is preceded by a lint wetting apparatus. In this case, agglomerates of lint and water can be formed by the lint wetting device by wetting fluff before the lint separator, and the lint wetting device has at least one steam generator and / or at least one nebulizer.

Durch die Benässung werden strömungstechnisch vor der Flusenabscheideeinrichtung Agglomerate aus Fluse(n) und Wasser gebildet. Diese Agglomerate können alleine deshalb schon einfacher und effektiver aus der Prozessluft entfernt werden als reine Flusen, da ihre räumliche Ausdehnung größer ist als bei reinen Flusen. Zudem verbessert das Wasser derAs a result of the wetting, agglomerates of fluff (n) and water are formed upstream of the lint separator. For this reason, these agglomerates can be removed from the process air more simply and more effectively than pure lint, since their spatial extent is greater than with pure lint. In addition, the water improves the

Agglomerate ein Anhaften an der Flusenabscheideeinrichtung, was eine Rückhaltung vereinfacht. Insgesamt werden so auch kleine Flusen einer effektiven und vergleichsweise einfachen Flusenrückhaltung zugänglich, und zwar auch mittels herkömmlicher Flusenabscheideeinrichtungen.Agglomerates adhere to the Flusenabscheideeinrichtung, which simplifies a retention. Overall, even small fluff of an effective and relatively simple Flusenrückhaltung be accessible, even by means of conventional Flusenabscheideeinrichtungen.

Erfindungsgemäß weist die Flusenbenässungsvorrichtung mindestens einen Dampferzeuger und/oder mindestens eine Vernebelungseinrichtung auf. Dadurch können Dampf und/oder kleine Wasserpartikel ("Nebelteilchen") mit hoher Dichte in einen Strom von flusenbehafteter Prozessluft eingebracht werden, was einen hohen Benetzungsgrad oder Benässungsgrad der Flusen und damit auch eine effektive Flusenrückhaltung oder Flusenabscheidung ermöglicht.According to the invention, the lint wetting device has at least one steam generator and / or at least one nebulizing device. As a result, steam and / or small particles of water ("mist particles") can be introduced into a stream of lint-laden process air at high density, which permits a high degree of wetting or wetting of the lint and thus also an effective lint retention or lint separation.

Der Dampferzeuger kann insbesondere ein Heißdampferzeuger oder ein Nassdampferzeuger sein.The steam generator may in particular be a hot steam generator or a wet steam generator.

Die Vernebelungseinrichtung kann insbesondere eine Sprüheinrichtung, ein Zerstäuber, insbesondere eine piezoaktorisch angetriebener Zerstäuber, oder eine Zentrifuge sein, insbesondere zur Erzeugung eines Aerosolnebels.The nebulizing device can be in particular a spray device, an atomizer, in particular a piezoactively driven atomizer, or a centrifuge, in particular for producing an aerosol mist.

Bei der Benetzung oder Benässung werden der Dampf und/oder die Nebelteilchen an der Oberfläche der Flusen absorbiert. Aufgrund einer Oberflächenspannung des Wassers können sich berührende Agglomerate oder Flusen sich miteinander verbinden. Aus dem gleichen Grund wird eine Haftung oder Adhäsion der Agglomerate an nahezu jedem Ort beobachtet, auf den die Agglomerate auftreffen oder nicht benässte Flusen auf einen benässten Ort auftreffen.Upon wetting or wetting, the vapor and / or the mist particles are absorbed at the surface of the lint. Due to surface tension of the water, contacting agglomerates or lint can bond together. For the same reason, adhesion or adhesion of the agglomerates is observed at almost any location where the agglomerates impinge or unimpregnated lint hits a wetted location.

Es ist noch eine bevorzugte Ausgestaltung, dass die Flusenabscheideeinrichtung einen Filterbeutel zum Zurückhalten benässter Flusen aufweist. Dieser weist den Vorteil auf, dass er preiswert ist, ein großes Fassungsvermögen aufweist und einfach zu reinigen ist. Zudem ermöglicht die längliche Ausdehnung eine ausreichende Zeitdauer zur effektiven Agglomeratbildung auch bei einer Einbringung von Dampf und/oder Nebelteilchen unmittelbar vor einer Öffnung des Filterbeutels. Durch die Agglomerate kann eine Porengröße vergleichsweise hoch sein, so dass eine Prozessluftströmung nicht wesentlich behindert wird.It is still a preferred embodiment that the Flusenabscheideeinrichtung has a filter bag for retaining wetted lint. This has the advantage that it is inexpensive, has a large capacity and is easy to clean. In addition, the elongate extent allows sufficient time for effective agglomeration even with an introduction of steam and / or mist particles immediately before opening the filter bag. Due to the agglomerates, a pore size can be comparatively high, so that a process air flow is not substantially hindered.

Es ist eine weitere bevorzugte Ausgestaltung, dass die Flusenabscheideeinrichtung ein flaches Sieb zum Zurückhalten benässter Flusen aufweist. Das flache Sieb ist einfach zu reinigen. Das Sieb kann insbesondere ein metallisches Sieb, ein Gewebe oder ein Vlies sein.It is a further preferred embodiment that the Flusenabscheideeinrichtung has a flat screen for retaining wetted lint. The flat screen is easy to clean. The sieve may in particular be a metallic sieve, a woven fabric or a fleece.

Es ist noch eine bevorzugte Ausgestaltung, dass die Flusenbenässungsvorrichtung dazu eingerichtet ist, mindestens eine verwirbelte Strömung von Dampf und/oder Nebelteilchen zu erzeugen. Dies verbessert eine Bildung der Agglomerate. Zur Verwirbelung kann die Flusenbenässungsvorrichtung beispielsweise mit einer oder als mindestens eine Freistrahldüse oder Karmansche Wirbelstromerzeugungseinrichtung ausgebildet sein.It is still a preferred embodiment that the Flusenbenässungsvorrichtung is adapted to generate at least a turbulent flow of steam and / or mist particles. This improves formation of the agglomerates. For swirling, the fluff-wetting device can be designed, for example, with one or at least one free jet nozzle or Karman swirling-flow generating device.

Es ist ferner eine bevorzugte Ausgestaltung, dass die Flusenabscheideeinrichtung einen Zyklonabscheider zum Abscheiden benässter Flusen aufweist. Die Agglomerate sind im Gegensatz zu einzelnen Flusen so schwer, dass sie sich vergleichsweise einfach aus der Prozessluft abtrennen lassen. Zudem haften die Agglomerate aufgrund der Adhäsion des Wassers gut an Wänden des Zyklonabscheiders, auf die sie auftreffen, was eine effektive Abscheidung oder Rückhaltung weiter unterstützt. Die Verwendung eines Zyklonabscheiders weist den Vorteil auf, dass er nicht gereinigt zu werden braucht, da er die Flusen in einem Flusen/Wasser-Gemisch (das sich z.B. durch ein Herunterrinnen der Agglomerate an den Wänden des Zyklonabscheiders ergibt) automatisch abführen kann und so auf eine Reinigung verzichtet werden kann, z.B. auf ein Entfernen von durch den Zyklonabscheider abgetrennten und folgend gesammelten Flusen, oder diese erheblich verkürzt werden kann.It is also a preferred embodiment that the lint separator has a cyclone separator for depositing wetted lint. In contrast to individual lint, the agglomerates are so heavy that they can be separated relatively easily from the process air. In addition, due to the adhesion of the water, the agglomerates adhere well to walls of the cyclone on which they strike, which further promotes effective separation or containment. The use of a cyclone separator has the advantage that it does not need to be cleaned because it can dissipate the lint in a lint / water mixture (resulting, for example, by the agglomerates from trickling down the walls of the cyclone separator) and so on a cleaning can be dispensed with, eg upon removal of lint separated and subsequently collected by the cyclone separator, or may be significantly shortened.

Es ist auch eine bevorzugte Ausgestaltung, dass eine durch Flusen kontaktierbare Wand des Zyklonabscheiders gezielt angefeuchtet ist. Dies verbessert eine Anhaftung von Agglomeraten und freien Flusen (so noch vorhanden) und auch ein Herunterrinnen der Flusen zu ihrer Ausscheidung aus dem Zyklonabscheider.It is also a preferred embodiment that a contacted by fluff wall of the cyclone is specifically moistened. This improves the adhesion of agglomerates and free lint (if still present) and also letting the lint down its exit from the cyclone separator.

Es ist eine für ein erleichtertes Herunterrinnen bevorzugte Ausgestaltung, dass eine durch benässte Flusen kontaktierbare Wand des Zyklonabscheiders mit einer Gleitschicht ausgerüstet ist. Die Gleitschicht mag insbesondere PTFE aufweisen, oder auch Nanostrukturen oder Nanopartikel, z.B. zur Herstellung eines Lotuseffekts.It is a preferred embodiment for facilitated down-drafting that a wall of the cyclone separator which can be contacted by wetted lint is equipped with a sliding layer. The sliding layer may in particular have PTFE, or else nanostructures or nanoparticles, for example for producing a lotus effect.

Es ist außerdem eine bevorzugte Ausgestaltung, dass der Zyklonabscheider einen Prozesslufteinlass und einen dazu angewinkelt ausgerichteten Drucklufteinlass aufweist, so dass durch den Drucklufteinlass eintretende Druckluft mittels durch den Prozesslufteinlass einströmende, flusenbehaftete Prozessluft in eine Drehbewegung versetzt wird. Dies ermöglicht eine besonders starke Drehbewegung und damit Abscheidewirkung.It is also a preferred embodiment that the cyclone separator has a process air inlet and a compressed air inlet oriented at an angle such that compressed air entering through the compressed air inlet is set into rotary motion by means of lint-laden process air flowing in through the process air inlet. This allows a particularly strong rotational movement and thus separation effect.

Es ist eine bevorzugte Weiterbildung, dass der Dampf und/oder die Nebelteilchen durch den Drucklufteinlass in die Flusenabscheideeinrichtung eingebracht werden oder zuführbar sind, was eine besonders gute Vermengung mit der flusenbehafteten Prozessluft ermöglicht. Ein Auslass der Flusenbenässungsvorrichtung mag also insbesondere in einen zu dem Drucklufteinlass führenden Druckluftkanal münden oder reichen. Alternativ mögen der und/oder die Nebelteilchen durch den Prozesslufteinlass in die Flusenabscheideeinrichtung eingebracht werden.It is a preferred development that the steam and / or the mist particles are introduced into the lint separator by the compressed air inlet or can be supplied, which enables particularly good mixing with the lint-laden process air. An outlet of the flax-wetting device may thus open or extend, in particular, into a compressed-air channel leading to the compressed-air inlet. Alternatively, the and / or the mist particles may be introduced into the lint separator through the process air inlet.

Alternativ mag die Prozessluft selbst eine Drehbewegung erzeugen, z.B. durch eine entsprechend gekrümmte Prozessluftführung in dem Zyklonabscheider.Alternatively, the process air itself may generate a rotational movement, e.g. by a correspondingly curved process air duct in the cyclone separator.

Die Aufgabe wird auch gelöst durch ein Wäschetrocknungsgerät, aufweisend eine Wäschetrommel und einen Prozessluft-Kondensator, welche über einen Prozessluft führenden Prozessluftkanal verbunden sind, und aufweisend eine strömungstechnisch hinter der Wäschetrommel und vor dem Kondensator in dem Prozessluftkanal angeordnete Flusenabscheideeinrichtung, wobei strömungstechnisch hinter der Wäschetrommel und vor der Flusenabscheideeinrichtung eine Flusenbenässungsvorrichtung angeordnet ist.The object is also achieved by a laundry dryer, comprising a laundry drum and a process air condenser, which are connected via a process air leading process air duct, and having a fluidically behind the laundry drum and in front of the condenser in the process air duct arranged Flusenabscheideeinrichtung, fluidically behind the laundry drum and a Flusenbenässungsvorrichtung is arranged before the Flusenabscheideeinrichtung.

Das erfindungsgemäße Wäschetrocknungsgerät ist den gleichen Vorteilen zugänglich wie die Flusenrückhaltevorrichtung und analog ausgestaltbar.The laundry drying device according to the invention is accessible to the same advantages as the lint retention device and can be configured in an analogous manner.

Das Wäschetrocknungsgerät kann insbesondere ein Wäschetrockner oder ein Waschtrockner sein.The laundry drying apparatus may in particular be a tumble dryer or a washer-dryer.

Der Prozessluft-Kondensator kann beispielsweise ein Kühlwasserkondensator oder ein Verdampfer einer Wärmepumpe sein.The process air condenser may be, for example, a cooling water condenser or an evaporator of a heat pump.

In den Figuren der beigefügten Zeichnung sind bevorzugte Ausführungsbeispiele der Erfindung schematisch dargestellt. Nachfolgend werden diese Ausführungsbeispiele genauer beschrieben. Dabei können zur Übersichtlichkeit gleiche oder gleichwirkende Elemente mit gleichen Bezugszeichen versehen sein. Es zeigen als Schnittdarstellungen in Seitenansicht:

Fig.1
eine Skizze eines Wäschetrockners;
Fig.2
eine Flusenabscheideeinrichtung gemäß einem ersten Ausführungsbeispiel; und
Fig.3
eine Flusenabscheideeinrichtung gemäß einem zweiten Ausführungsbeispiel.
In the figures of the accompanying drawing preferred embodiments of the invention are shown schematically. Hereinafter, these embodiments will be described in detail. In this case, the same or equivalent elements may be provided with the same reference numerals for clarity. It show as sectional representations in side view:
Fig.1
a sketch of a tumble dryer;
Fig.2
a Flusenabscheideeinrichtung according to a first embodiment; and
Figure 3
a Flusenabscheideeinrichtung according to a second embodiment.

Fig.1 zeigt als Schnittdarstellung in Seitenansicht eine Skizze eines Wäschetrocknungsgeräts in Form eines Umluft-Wäschetrockners W. Der Wäschetrockner W weist eine Wäschetrommel 11 zur Aufnahme von zu trocknender Wäsche (o.Abb.) auf. An die Wäschetrommel 11 ist ein umlaufender Prozessluftkanal 12 angeschlossen. Und zwar kann warm-feuchte Prozessluft P aus der Wäschetrommel 11 in den Prozessluftkanal 12 eintreten und strömt zu einem Prozessluft-Kondensator 13, welcher die Prozessluft P abkühlt und auskondensieren lässt, so dass sie folglich hinter dem Prozessluft-Kondensator 13 als kühl-trockene Prozessluft P vorliegt. Diese kühl-trockene Prozessluft P strömt weiter zu einer Heizung 14, in welcher sie aufgeheizt wird, um folgend als warm-trockene Prozessluft P wieder in die Wäschetrommel 11 eingeführt zu werden. Die warm-trockene Prozessluft P ist besonders geeignet, der Wäsche Feuchtigkeit zu entziehen. Die Strömung der Prozessluft P in dem Prozessluftkanal 12 wird mittels eines Gebläses 15 bewerkstelligt, welches hier beispielhaft zwischen dem Prozessluft-Kondensator 13 und der Heizung 14 in den Prozessluftkanal 12 eingeschaltet ist. Fig.1 shows a sectional side view of a sketch of a laundry dryer in the form of a circulating air dryer W. The dryer W has a laundry drum 11 for receiving laundry to be dried (o.Fig.) On. To the laundry drum 11, a circulating process air channel 12 is connected. Namely, warm-moist process air P can enter from the laundry drum 11 into the process air channel 12 and flows to a process air condenser 13, which cools and condenses the process air P, so that they are behind the process air condenser 13 as cool-dry process air P is present. This cool-dry process air P continues to flow to a heater 14 in which it is heated in order to be reintroduced into the laundry drum 11 as a warm-dry process air P. The warm, dry process air P is particularly suitable for removing moisture from the laundry. The flow of the process air P in the process air channel 12 is accomplished by means of a blower 15, which is here, for example, between the process air condenser 13 and the heater 14 in the process air channel 12 turned on.

Zwischen der Wäschetrommel 11 und dem Prozessluft-Kondensator 13 befindet sich eine Flusenabscheideeinrichtung 16 zur Abscheidung oder Abtrennung von Flusen aus der Prozessluft P. Die Flusen werden typischerweise mit der in der Wäschetrommel 11 über die Wäsche streichenden Prozessluft P mitgerissen. Die Flusenabscheideeinrichtung 16 soll verhindern, dass die Flusen an den Prozessluft-Kondensator 13 gelangen und diesen wärmedämmend überziehen.Between the laundry drum 11 and the process air condenser 13 there is a lint separator 16 for separating or separating lint from the process air P. The lint is typically entrained with the process air P sweeping the laundry drum 11 over the laundry. The Flusenabscheideeinrichtung 16 is to prevent the lint get to the process air condenser 13 and this heat-insulating cover.

Der Wäschetrockner W weist eine strömungstechnisch vor der Flusenabscheideeinrichtung mit dem Prozessluftkanal 12 verbundene Flusenbenässungsvorrichtung 17 auf. Mittels der Flusenbenässungsvorrichtung 17 werden Wasserdampf und/oder Nebelteilchen vor der Flusenabscheideeinrichtung 16 in den Prozessluftkanal P eingebracht, um Agglomerate aus Wasser und Flusen zu erzeugen, welche Agglomerate sich durch die Flusenabscheideeinrichtung 16 erheblich besser zurückhalten lassen als einzelne (trockene) Flusen. In einer Variante können die Flusenabscheideeinrichtung 16 und die Flusenbenässungsvorrichtung 17 auch in einer gemeinsamen Baugruppe integriert sein.The tumble dryer W has a fluidly connected before the Flusenabscheideeinrichtung with the process air duct 12 Flusenbenässungsvorrichtung 17. By means of the Flusenbenässungsvorrichtung 17 steam and / or mist particles are introduced before the Flusenabscheideeinrichtung 16 in the process air duct P to produce agglomerates of water and lint, which agglomerates can be retained much better by the Flusenabscheideeinrichtung 16 than single (dry) lint. In one variant, the Flusenabscheideeinrichtung 16 and the Flusenbenässungsvorrichtung 17 may also be integrated in a common assembly.

Die Flusenbenässungsvorrichtung 17 kann beispielsweise einen Dampferzeuger und/oder eine Vernebelungseinrichtung (z.B. einen piezoelektrisch arbeitenden Aerosol-Erzeuger) aufweisen.The lint wetting device 17 may comprise, for example, a steam generator and / or a nebuliser (e.g., a piezoelectric aerosol generator).

Fig.2 zeigt als Schnittdarstellung in Seitenansicht eine mögliche Ausgestaltung der Flusenabscheideeinrichtung 16 gemäß einem ersten Ausführungsbeispiel. Die Flusenabscheideeinrichtung 16 weist hier einen Filterbeutel 20 zum Zurückhalten benässter Flusen auf. Strömungstechnisch vor dem Filterbeutel 20 münden mindestens zwei Düsenköpfe 21 der Flusenbenässungsvorrichtung 17 in den Prozessluftkanal 12, mittels welcher mittels Druckluft Dampf und/oder Nebelteilchen D in den Prozessluftkanal 12 eingebracht werden, um sich mit der flusenbehafteten Prozessluft P zu mischen und die Agglomerate zu bilden. Fig.2 shows a sectional view in side view of a possible embodiment of the Flusenabscheideeinrichtung 16 according to a first embodiment. The Flusenabscheideeinrichtung 16 here has a filter bag 20 for retaining wetted lint. Fluidically before the filter bag 20, at least two nozzle heads 21 of the flax wetting device 17 open into the process air channel 12, by means of which compressed air and / or mist particles D are introduced into the process air channel 12 in order to mix with the lint-containing process air P and to form the agglomerates.

Strömungstechnisch hinter den Düsenköpfen 21 und damit hier im Prozessluftkanal 12 befindet sich jeweils ein Körper 22, welcher von dem Dampf und/oder den Nebelteilchen D umströmbar ist. Bei einer Umströmung bildet sich hinter den Körpers eine sog. Karmansche Wirbelstraße K mit gegenläufigen Wirbeln aus. Durch die Wirbel wird eine Durchmischung der Prozessluft P mit Dampf und/oder Nebelteilchen D und damit eine Agglomeratbildung verbessert. Aufgrund der in Strömungsrichtung der Prozessluft P länglichen Ausdehnung des Filterbeutels 20 ergibt sich eine für eine besonders effektive Vermischung ausreichend lange Strecke.Fluidically behind the nozzle heads 21 and thus here in the process air channel 12 is in each case a body 22, which is flowed around by the steam and / or the mist particles D. In a flow around the body forms a so-called Karman vortex street K with counter-rotating vortices. Through the vortex mixing of the process air P with steam and / or mist particles D and thus an agglomeration is improved. Due to the elongated in the flow direction of the process air P expansion of the filter bag 20 results in a sufficiently effective for a particularly long mixing distance.

Fig.3 zeigt als Schnittdarstellung in Seitenansicht eine weitere mögliche Flusenabscheideeinrichtung 16 gemäß einem zweiten Ausführungsbeispiel mit einem Zyklonabscheider 31. Dieser Zyklonabscheider 31 mag beispielsweise einen ähnlichen Grundaufbau wie ein in US 6,270,558 B1 beschriebener Zyklonabscheider aufweisen. Bei dem Zyklonabscheider 31 wird eintretende Prozessluft P mittels eines seitlich eingelassenen Druckluftstrahls A in Rotation versetzt, wobei die Prozessluft P in dem Zyklonabscheider 31 aufgrund einer kegelstumpfförmigen äußeren Wand 32 und eines darin angeordneten kegelstumpfförmigen Körpers 33 auf einer sich kegelstumpfförmig aufweitenden Spiralbahn läuft. Das Vorsehen des Körpers 33 bewirkt eine Aufrechterhaltung einer durchgängig hohen Geschwindigkeit und Rotationsenergie der Prozessluft P. Durch die Rotationskomponente der Prozessluft P werden schwerere Teilchen an die Wand 32 gedrückt und können so räumlich von der leichteren (reinen) Prozessluft P getrennt werden. Figure 3 shows a sectional side view of another possible Flusenabscheideeinrichtung 16 according to a second embodiment with a cyclone 31. This Zyklonabscheider 31 may, for example, a similar basic structure as a in US 6,270,558 B1 have described cyclone separator. In the cyclone 31 entering process air P is set by means of a laterally introduced compressed air jet A in rotation, the process air P in the cyclone 31 due to a frusto-conical outer wall 32 and a frusto-conical body 33 disposed therein on a truncated cone extending spiral path runs. The provision of the body 33 results in maintaining a consistently high velocity and rotational energy of the process air P. By the rotational component of the process air P heavier particles are pressed against the wall 32 and can be spatially separated from the lighter (pure) process air P.

Bei dem gezeigten Zyklonabscheider 31 wird mit dem Druckluftstrahl A der durch die Flusenbenässungsvorrichtung 17 erzeugte Dampf und/oder Nebelteilchen D eingebracht. Die sich so bildenden Agglomerate höherer Masse werden durch die Rotationsbewegung (Zentrifugalkraft) effektiv an die Wand 32 geworfen und bleiben dort aufgrund der hohen Adhäsion von Wasser haften, bis sich genug Wasservolumen gesammelt hat, dass das Wasser mit den damit verbundenen Flusen herablaufen kann, z.B. als Wassertropfen T. Die Wassertropfen T können beispielsweise in einer Wanne 34 aufgefangen werden. Die aus dem Zyklonabscheider 31 austretende Prozessluft P ist hochgradig von Flusen befreit. Zudem dient der Zyklonabscheider 31 auch einer weiteren Trocknung der Prozessluft P, da von der Wäsche mitgenommene Feuchtigkeit sich ebenfalls an der Wand anlagern und folgend abtropfen kann.In the cyclone separator 31 shown, the compressed air jet A is used to introduce the steam and / or mist particles D produced by the flax wetting device 17. The higher mass agglomerates thus formed are effectively thrown against the wall 32 by the rotational movement (centrifugal force) and adhere there due to the high adhesion of water until enough water volume has accumulated to allow the water to run down with the lint associated therewith, e.g. as drops of water T. The drops of water T can be collected, for example, in a tub 34. The process air P emerging from the cyclone separator 31 is highly freed from lint. In addition, the cyclone separator 31 also serves to further dry the process air P, since moisture entrained by the laundry can also be deposited on the wall and subsequently drip off.

Zur einfacheren Sammlung von Wassertropfen T mag die Wand 32 zumindest an ihrer durch die Agglomerate benetzbaren Oberseite mit einer Gleitschicht ausgerüstet sein, z.B. aus PTFE, Nanostrukturen oder Nanopartikeln, z.B. zur Herstellung eines Lotuseffekts.For easier collection of water droplets T, the wall 32 may be provided with a sliding layer, at least on its upper side wettable by the agglomerates, e.g. PTFE, nanostructures or nanoparticles, e.g. for making a lotus effect.

Selbstverständlich ist die vorliegende Erfindung nicht auf die gezeigten Ausführungsbeispiele beschränkt. So kann in einem Zyklonabscheider z.B. auch auf den Körper 33 verzichtet werden. Auch mag der Zyklonabscheider eine gezielt benässte Wand aufweisen, wozu beispielsweise eine Berieselungsanlage einsetzbar sein mag. Allgemein mag die Flusenbenässungsvorrichtung durch an dem Prozessluft-Kondensator ausfallendes Kondensat gespeist werden.Of course, the present invention is not limited to the embodiments shown. For example, it is also possible to dispense with the body 33 in a cyclone separator. The cyclone separator may also have a selectively wetted wall, for which purpose, for example, a sprinkler system may be used. Generally, the fluff wetting device may be fed by condensate precipitating on the process air condenser.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1111
Wäschetrommelwashing drum
1212
ProzessluftkanalProcess air duct
1313
Prozessluft-KondensatorProcess air capacitor
1414
Heizungheater
1515
Gebläsefan
1616
FlusenabscheideeinrichtungFlusenabscheideeinrichtung
1717
FlusenbenässungsvorrichtungFlusenbenässungsvorrichtung
2020
Filterbeutelfilter bag
2121
Düsenkopfnozzle head
2222
Umströmbarer KörperFlow around body
3131
Zyklonabscheidercyclone
3232
Wandwall
3333
Kegelstumpfförmiger KörperTruncated cone-shaped body
3434
Wannetub
AA
DruckluftstrahlCompressed air jet
DD
Dampf und/oder NebelteilchenSteam and / or mist particles
KK
Karmansche WirbelstraßeKarman vortex street
PP
Prozessluftprocess air
TT
WassertropfenWaterdrop
WW
Wäschetrocknerclothes dryer

Claims (10)

  1. Laundry drying appliance (W) with a fluff retention apparatus (16, 17) having a fluff separator (16), upstream of which a fluff wetter (17) is connected, characterised in that through the fluff wetter (17) conglomerations of fluff and water can be formed by means of fluff wetting upstream of the fluff separator (16) for flow purposes, wherein the fluff wetter (17) has at least one vapour generator and/or at least one vaporiser.
  2. Laundry drying appliance (W) according to claim 1, wherein the fluff separator (16) has a filter bag (20) for retaining wet fluff.
  3. Laundry drying appliance (W) according to claim 1, wherein the fluff separator (16) has a flat sieve for retaining wet fluff.
  4. Laundry drying appliance (W) according to one of claims 2 and 3, wherein the fluff wetter (17) is designed to generate at least one eddying flow (K) of vapour and/or mist particles (D).
  5. Laundry drying appliance (W) according to claim 1, wherein the fluff separator (16) has a cyclone separator (31) for separating wet fluff.
  6. Laundry drying appliance (W) according to claim 5, wherein a wall (32) of the cyclone separator (31) that can be brought into contact with wet fluff is moistened.
  7. Laundry drying appliance (W) according to one of claims 5 and 6, wherein a wall (32) of the cyclone separator (31) that can be brought into contact with wet fluff is provided with an easy-slide coating.
  8. Laundry drying appliance (W) according to one of claims 5 to 7, wherein the cyclone separator (31) has a process air inlet and a pressurised air inlet aligned at an angle thereto, so that pressurised air (A) entering through the pressurised air inlet is made to move in a rotating manner by process air (P) containing fluff, which flows in through the process air inlet.
  9. Laundry drying appliance (W) according to claim 8, wherein vapour and/or mist particles (D) generated by the fluff wetter (17) can be fed into the process air (P) through the pressurised air inlet.
  10. Laundry drying appliance (W) according to one of the preceding claims, wherein the laundry drying appliance (W) has a laundry drum (11) and a process air condenser (13), which are connected by way of a process air channel (12) conducting process air (P), and having a fluff separator (16, 17), disposed in the process air channel (12) for flow purposes downstream of the laundry drum (11) and upstream of the process air condenser (13), wherein the fluff wetter (17) is disposed for flow purposes downstream of the laundry drum (11) and upstream of the fluff separator (16).
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US13/546,070 US9580859B2 (en) 2012-07-11 2012-07-11 Lint retention for a laundry drying appliance
PCT/IB2013/055410 WO2014009851A2 (en) 2012-07-11 2013-07-02 Lint trap for a tumble drier

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EP2872686A2 EP2872686A2 (en) 2015-05-20
EP2872686B1 true EP2872686B1 (en) 2016-04-06

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EP (1) EP2872686B1 (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017116611A1 (en) 2016-07-29 2018-02-01 Miele & Cie. Kg A lint separator for a dryer and method for operating a lint separator
DE102017116618A1 (en) 2017-07-24 2019-01-24 Miele & Cie. Kg Floor element for a tumble dryer for catching lint particles

Also Published As

Publication number Publication date
WO2014009851A3 (en) 2014-07-03
CN104662220A (en) 2015-05-27
PL2872686T3 (en) 2016-09-30
WO2014009851A2 (en) 2014-01-16
RU2015101828A (en) 2016-08-27
RU2597582C2 (en) 2016-09-10
US20140013608A1 (en) 2014-01-16
EP2872686A2 (en) 2015-05-20
CN104662220B (en) 2017-11-07
US9580859B2 (en) 2017-02-28

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